Lucene/Solr is the most deployed search technology in the world, used by companies such as Netflix, AT&T, Sears, Ford, and Verizon. According to Ingersoll, Twitter search is powered by Lucene, handling more than a billion queries a day, with close to four hundred million tweets indexed and available within 50 milliseconds of being posted (see here for a 2010 post about Lucene by the Twitter engineering team).

Not half as suprised as Microsoft! Lucence may have more people using it to search than the various versions of SharePoint but I’m prepared to bet that there are more instances of SharePoint search (2003/2007/2010) than there are of Lucene.

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Stephen E. Arnold monitors search, content processing, text mining
and related topics from his high-tech nerve center in rural Kentucky.
He tries to winnow the goose feathers from the giblets. He works with colleagues
worldwide to make this Web log useful to those who want to go
"beyond search". Contact him at sa [at] arnoldit.com. His Web site
with additional information about search is arnoldit.com.